I think there's a configuration issue with KDE in Sabayon that's hopefully easy to solve. On the announcement for the latest Sabayon, there's this statement:

/tmp is now mounted on a very small tmpfs with nodev,noexec,nosuid options by default for greater security. Some exotic programs that insist on writing to /tmp may fail to run and they should be fixed upstream. Writing to /tmp is bad, and you should not use any software that behaves like this.

Unfortunately, it seems that one of the supported desktops, KDE, behaves like this. I was poking through System Settings and trying to install different splash screens, plasma themes, etc, and it seems that KDE downloads these into /tmp before unpacking them. I kept running out of space on /tmp trying to install a simple theme.

I'm thinking that there must be some way to tell KDE to use a different directory for /tmp, but I haven't been able to figure out how. Does anybody know how to do this? And if we can figure this out, probably it should be set as the default for new Sabayon installations, so that new users don't run into this.

Does anybody have an idea how to redirect KDE's use of /tmp to somewhere else? I was thinking $USER/tmp might be a good place.

Yeah; I did the same thing, but I don't think that's the "Sabayon" way. I looked at the configuration of my work machine (running Netrunner, based on Kubuntu), and saw that I have various symlinks in my .kde folder:

I created one of the symlinks and rebooted, but it doesn't look like any files are being created in /var/tmp/kde-[user name]. But I think I'm on the right track.

I respectfully suggest that perhaps whatever KDE configuration exists in other distros to redirect /tmp over to /var/tmp needs to be done for Sabayon, especially if Sabayon wants to restrict the size of /tmp.